With halide-19.0.0.dev36, a numpy.float32(1.2) as an argument to halide.Expr's constructor will give a resulting Expr of type hl.Bool():

>>> hl.Expr(np.float32(4.5))
<halide.Expr of type bool: (uint1)1>

Earlier versions like halide 13 also give unexpected results: <halide.Expr of type int32: 4>.

I'm not sure if this is an unintended use case or unintended behavior.
I initially discovered it because np.float32(np.pi) was part of a calculation and it ended up being treated as an integer, giving wrong results.

I would be greatful if you have any ideas to fix or avoid this type of behavior.
(Short term, we are keeping away from numpy.float32)

Here is a minimal example/test:

import halide as hl
import numpy as np

assert (hl.Expr(np.float32(1.2))).type() == hl.Float(32) # Error, currently gives hl.Bool() (or hl.Int(32))